Fault Phenomenon: Komatsu 830E electric wheel mining truck power output fluctuates, instrument reports generator fault.

Troubleshooting Process:
– Checked carbon brushes: brushes worn to limit, spring pressure insufficient.
– Checked commutator: commutator surface burnt or grooved.
– Checked brush holder: brush holder sticking.
– Checked wiring: excitation circuit poor contact.

Root Cause: The main generator carbon brushes are excessively worn, causing poor contact with the commutator, resulting in sparking and current fluctuation.

Required Parts: Replace full set of main generator carbon brushes, grind commutator.